Electric motor



(No Model.)

P. DIEHL.

ELECTRIC MOTOR.

No. 389,876. Patented Sept. 25, 1888 INVENTOR Q ATTO N. PETERS. Phnb-Lilhagmpher, Wnhingmn. D. c.

UNITED STATES PATENT EEicE.

PHILIP DIEHL, OF ELIZABETH, NEW JERSEY.

ELECTRHC MDTGR.

SPECTPICATION forming part of Letters Patent No, 389,876, dated September 25, 1888.

(No model.)

To aZZ whom it "may concern:

Be it known that I, PHILIP DIEH'L, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Electric Motors, of which the following is a specification, reference being had therein to the accompanying drawings.

The object of my invention is to provide a simple and convenient regulating mechanism or apparatus for electric motors, such mechanism or apparatus being of such construction that by varying the position of a regulating lever the speed of the motor may be varied, as desired, or the motor stopped altogether; and when the said lever is placed in such position as to break the electric circuit a brake will be applied to the motor flywheel to an rest the rotation of the same, the said brake being a part of the regulatinglever or being so connected with said lever as to be operated simultaneously therewith.

My invention is more especially intended for use in connection with electric motors adapted for driving sewing or other light machines, but may also be used in connection with large motors, if desired.

In the drawings, Figure 1 is the side view of a sewing-machine with my improvement applied thereto. Fig. 2 is a rear end view of the same. Fig. 3 is a detail plan view of a part of the regulating mechanism. Fig. 4 is a detail plan view of the contact-plates, show ing the resistaneecoils.

A denotes a sewing-machine, the balance or fly wheel 13 of which contains a motor which is or may be similar in construction to the motor fully shown and described in my patent, No. 356,576, dated January 25, 1887. The current to and from the motor passes through the conductors O and 1), leading down inside the arm of the machine, said conductors being the usual terminals of the iicldniagnet of the motor. The conductor or terminal 0 is in contact with the plate 0, which is connected with the bindingpost E, and the con ductor or terminal D is in contact with the L- shaped plate at the point m, Fig. 4, said plate a forming a part of the regulating device. An ranged within the recess of the L-shaped plate i are the contact-plates i, i and i, which are insulated from the plate 1 but which are connected together through the resistance-coils e. The plate 2" is connected with the bindingpost F. (See Fig. 2.)

G is a lever pivoted to a standard, a, secured to the machine bed-plate by screws a, the said lever having a handle, G, and an arm, The arm g is provided with a lateral extension, 9, to which is secured a thin conducting plate or brush, h, of copper or other similar metal. The brush h is so arranged (see Fig. 3) that it may be adjusted to be in contact with any one of the plates 2" i i and the plate 'i', and when so adjusted it will complete the circuit. 1f the said brush be adjusted so as to be in contact with the plate 93 and the plate 2', the full force of the current will pass without resistance; but if the brush be adjusted so as to be in contact with either of the plates or and the plate 2' the strength of the current will be diminished by the resistance offered by one or both of the resistancecoils 0, according to which one of the plates 2 or i is conductively connected with the said plate i by the said brush or conductor h. Of course the number of the resistance-coils and of the contact-plates which are arranged within the recess of the plate 2' may be increased, if desired, according to circumstances.

I is a coutact platc, which is insulated from the other contact-plates, and when the lever G is so adjusted that the brush or conductor h is in contact with the said insulated plate I, as in Figs. 2 and 3, the circuit will be broken, and when the regulating-leveris thus adjusted to such position as to break the circuita brake is applied to the fiy or balance wheel of the motor to quickly arrest the rotation of said wheel simultaneously with the breaking of the circuit.

The brake shown in the present instance consists of a friction-block, J, carried by the lever G; but it will be understood that any other suitable friction device or brake, to be operated directly or indirectly by the :egulating-lever, may be employed.

Secured to the standard A, in such position as to engage the arm g of the regulatinglever, is a retaining-spring, K, having an inclined portion, 7:, a straight portion, 7;, beyond the said inclined portion, or nearer to its free end than the latter, and also preferably a hook or projection, 7. at its end. lVhen the regulating-lever is so adjusted that the brush or conductor his in contact with any one of the plates '6 t and the plate i, the straight portion it of the said spring will press against the said lever, and thus securely hold the latter in any position in which it maybe placed; but when the lever is moved to bring the brush in contact with the insulated plate I the arm 9 will come opposite the inclined portion 7a of the said spring, and the latter, pressing against said arm, as shown in Fig. 3, will force the friction-block J against the fly-wheel B, to arrest the rotation thereof.

The regulating-lever G may be operated by the handle G, or through the rod or pitman M, connected with a suitable treadle. The hook or projection k on the spring K will serve as a stop to prevent the said lever from being moved too far downward when the circuit is closed.

It will be understood that the details of my invention may be varied within the province of mechanical skill without departing from the essential features thereof, and I do not therefore wish to be understood as limiting my invention to the particular details herein shown and described. The brake, to arrest the movements of the motor when the circuit sistance, a regulating-lever carrying a brush or conductor, a friction block or brake operated coincidently with the said lever and arranged to press against the motor-wheel and thus arrest the movement of the motor when the circuit is broken, and a spring for holding the said lever in different positions to which it may be adjusted when the circuit is closed, substantially as set forth.

2. The combination,with an electric motor, of a series of contact plates or devices, a reagainst the motor-wheel when the circuit is broken, substantially as set forth.

3. The combination,with an electric motor, of the regulating-lever G, the brush or conductor h, carried by the said lever, the holding-spring K; the L-shaped contact-plate i, the contact-plates i '5 i arranged in the recess of the plate 1' and insulated therefrom, and the resistance-coils e, substantially as set forth.

at. The combinatiomwith an electric motor, of the regulating-lever G, the friction block-or brake J and the brush or conductor h, both carried by said lever, the L-shaped contact plate 2', the contact-plates t, 2", and i insulated from the said plate i,the resistance-coils acounecting the said plates i, i and t the insulated plate I, and the spring K, having the inclined portion 7; and the straight portion 71 substantially as set forth.

5. The combination,with an electric motor, of the lever G, the friction block or brake J, and the spring K, having theinclined portion for forcing the said friction-block against the motor-wheel, substantially as set forth.

6. The combination,with an electric motor, of a lever for breaking or closing the circuit in which the said motor is connected, a friction block or brake operated by the said lever, and a spring adapted to hold the said lever in position to close the circuit, and also to force the brake against the motor-wheel to arrest the motion of the meter when the circuit is opened or broken, as set forth.

7. The combination,with an electric motor, of a lever provided with a friction block or brake, and a spring adapted either to hold the brake away from the motor-wheel or to force it against said wheel, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

PHILIP DIEHL.

\Vitnesses:

AUGUST DIEHL, FRED DIE at. 

